It's quite easy to remove the ss cog but will require a specific tool. Threading on the fixed cog can be done by hand BUT to tighten it properly you either need a chain whip tool or you really need to Stomp on the pedals hard (ideally while clipped in). Your biggest problem is that there most likely won't be a lockring thread on the hub. I don't use a lockring when racing on the track but on the street I'd say it's a good idea to have it on there as a safety measure to stop the cog unwinding in emergency situations. Post a pic of the hub and we'll be able to tell you more.

You can use a bottom-brace lock-ring on a threaded rear hub - it is the same diameter and thread. This used to be called a "suicide hub" as the lock ring can unthread. proper fixed gear hubs have a left-hand threaded locking which will tighten as the sprocket loosens.

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